How to send AE A7 04 00 05 09 BC B7 command to BLE

Question

I need to send AE A7 04 00 05 09 BC B7 command to BLE device. Can You help me to manage it ? I mean what and how have I to do after connection to device ?

public void WriteValue(String strValue)
    {
            mNotifyCharacteristic.setValue("AE A7 04 00 05 09 BC B7".getBytes());
            mBluetoothGatt.writeCharacteristic(mNotifyCharacteristic);
            boolean sendStatus = mBluetoothGatt.writeCharacteristic(mNotifyCharacteristic);"+mNotifyCharacteristic.getProperties());
    }

@Override
        public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic,
                                        int status)
        {
            Log.d("TESTING","status !!!= "+status);
        }

It is unclear to me what you have to send. Is that a string? — greenapps, May 06 '17 at 15:04
How I understand I can send only byte array so in the end I am doing this convertation: mNotifyCharacteristic.setValue("AE A7 04 00 05 09 BC B7".getBytes()); mBluetoothGatt.writeCharacteristic(mNotifyCharacteristic); But I am not sure that I get the sending process right... — abrutsze, May 06 '17 at 15:20
Yes there are, but I am getting status=0, so someting is wrong — abrutsze, May 06 '17 at 16:04
Ask them how many bytes you had to send for the 'string' you mentioned. In the way you do it now you would send 23 bytes. But it could be that the receiver only expects 8 bytes. Quite possible. — greenapps, May 06 '17 at 16:06
About which status are you talking? You should show us relevant code. In your post. Not in comments of course. — greenapps, May 06 '17 at 16:07
Just updated the code. The reciver wait exactly for AE A7 04 00 05 09 BC B7. — abrutsze, May 06 '17 at 16:18
That is not expressed exact. How many bytes would that be? Does the receiver expect spaces? — greenapps, May 06 '17 at 16:47
`WriteValue(String strValue)`. You are not writing that string value. — greenapps, May 06 '17 at 16:57
I think this line writes: mBluetoothGatt.writeCharacteristic(mNotifyCharacteristic); — abrutsze, May 06 '17 at 17:10
just forgot to delete it mNotifyCharacteristic.getProperties() — abrutsze, May 06 '17 at 17:10
How many bytes would that be --- as the command is, about spaces: I do not know, there is nothing about it in doc — abrutsze, May 06 '17 at 17:11

score 0 · Answer 1 · answered May 07 '17 at 07:58

0

You need to convert your string properly to a byte array using a hex to byte array conversion rather than just taking the ascii value of each character.

answered May 07 '17 at 07:58

Emil

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Can You give an example, please ? Currently I am doing in this way: public void WriteValue(String strValue) { mNotifyCharacteristic.setValue(strValue.getBytes()); mBluetoothGatt.writeCharacteristic(mNotifyCharacteristic); } – abrutsze May 10 '17 at 05:20
You have the answer here https://www.google.se/search?q=java+hex+to+byte+array. But make sure to remove the spaces in your string first. – Emil May 10 '17 at 07:13
I have changed the code to this one, but the result is the same: String s="AEA704000509BCB7"; byte[] b = new BigInteger(s,16).toByteArray(); mNotifyCharacteristic.setValue(b); mBluetoothGatt.writeCharacteristic(mNotifyCharacteristic); – abrutsze May 10 '17 at 07:31

How to send AE A7 04 00 05 09 BC B7 command to BLE

1 Answers1